I am working toward methylation of CpG Islands. I was wondering if there was a preferred treatment of bisulfite over metabisulfite.Any suggestions or guidance would be much appreciated. Thanks!

Try the Qiagen 'EpiTect Bisulfite Kit' or Zymo Research's 'EZ DNA Methylation Gold Kit'. Both show an excellent performance regarding cytosine-conversion, DNA-yields and low template-degradation. They are easy to handle and have short hands-on times...

I have in my notes very early on that both compounds are different and you need to work out the stoichometry of the Bisulfite ions released into solution from both compounds and go from there. I'll try and dig up my notes and get back to you.